Machine for grinding rollers having an arc-shaped generatrix



Feb. 112 1924,

. V. A. SVENSSON MAGHINE FOR GRINDING ROLLERS HAVING AN ARC SHAPED GENERATR X Filed Aug. 24; 1920 2 Sheets-Sheet l fivemifom yam Feb. 12 1924.

. V.- A. SVENSSON MACHINE FOR GRINDING ROLLERS HAVING AN ARC SHAPED GENERATRIX Filed Aug. 24", 1920 2 Sheets-Sheet 2 &6

PatentedFeb'. 12, 1924.

v UNITED STATES 1,483,754 PATENT oFFr-ce.

VICTOR A. SV ENSSON, OF NEW YORK, N. Y., ASSIGNOR T0 AKTIIl IBOLAGET SVENSKA KULLAGERIABRIKEN, OF GOTTENBOIRG, SWEDEN, Av CORPORATION OFSWEDEN.

MACHINE FOR GRINDING ROLLERS HAVING- AN ARC-SHAPED GENERATRIX.

Application filed August 24, 1920. Serial No. 405,636.

To all whom it mayponcern:

Be it known that I, Vwron ABRAHAM SVENSSON, a subject of the King of Sweden, residin in the city of New York, county of New ork, and State of New York, have invented certain new and useful Improvements in Machines for Grinding Rollers Having an Arc-Shaped Generatrix, of which the following is a specification, reference being had therein -to the accompanying drawings.

This invention relates to improvements in machines for grindingrollers-having an arc-shaped generatrix.

Machines of this kind are known in which the grinding operation is performed by means of a rotating grinding disc the working surface of which is curved in essential conformity to the arc-shaped profile of the rollers, the rollers being mounted, during the 'inding operation, in a roller cage 'provide with pockets for retaining the rollers. In such machines the axis of the roller cage coincides with the axis of rotation of the grinding disc, the result being that the rollers are acted upon, during the grinding operation, by one and the same part of the working surface of the grinding disc. As the latter is generally worn unevenly, it is very difl'icult to grind rollers in machines of said kind with such exactness as is required for instance for roller bearings. 1

According to my present invention,,th'e said drawback is avoided by an improved construction of the grinding machine.

The invention consists chiefly in the combination with a grinding machine of the kind above referred to, of a rotating grind ing disk the working surface of which is formed in essential conformity withthe arc-. shaped profile of the rollers, a roller race the axis of which forms an angle with the axis of rotation of 'the grinding disc,-and a roller cage rotatable in relation to the roller race and adapted to guide the rollers when rotating on said race during the grinding operation. c n

By this construction of the grinding machine, the grinding disc will be worn absolutely evenly and accordingly always main tain its exact profile in conformity with the arc-shaped generatrix of the rollers to be ground. l I In 'the accompanying drawings I have shown an embodiment of my inviention.

cage consists of two parts, viz. a retaining and driving ring 2 which is connected to a central rotating spindle 3, and an outer guidmg ring 6 connected to a sleeve? which is rotatably journalled on a stationary sleeve 5 by means of ball bearings." The roller race 1s provided one. ring made in two parts 4, 4' and secured to the sleeve The retaining and driving ring 2 is pro-' vided with fingers 8, see Figs. 2 and 3, which project between the rollers and bring the latter to partake in the rotation of the spindle 3. The parts 4, 4' and 6, of which the parts 4, 4 may be integral, have such a form that the transverse middle planes of the rollers all intersect each other in a common point a on the axis of the roller cage. The spindle 3 is not-only rotatable but also movable in' its longitudinal directioinandit is acted upon by a spring 9 which normally holds the spindle raised in the position shown in Figs. 1 and 2. By depressing a lever 1O acting upon the upper end of the spindle 3, the latter may be moved downwards, thus lowering the retainer 2 with its fingers 8 in relation to the parts 4 and 6. The rollers may then be easily put into the roller cage or taken out therefrom.

The roller cage and the race ring as a 'whole is vertically movable on guides 11 in the frame 12. Journaled in the roller cage'is a shaft 13 which is parallel with the spindle 3, andkeyed to the said shaft 13 is a pulley 14 driven by a belt (not shown in the drawings) from a pulley 15. Secured to the shaft 13 are also two gears 16 and 17 of equal size, the upper one meshing with a toothed" wheel 18 on the spindle 3 and the lower one with a toothed wheel It? on the sleeve 7. By said 'gearings, the driving ring 2 and the guiding ring'G are rotated in the same direction and with equal velocity, the intermediate ring 4 being stationary.

' operation and the mac ine is started.

the grinding disc 20, the driving ring 2 and The rollers 1 are in this manner caused to rotate about their own axes and at the same time rotate about the axis of the roller cage,

or the spindle 3.; I

The grinding disc 20 is secured to a vertical shaft 21 journaled on a slide 22 which having its centre in the point a in which 7 the axis of rotation of the grinding disc and the axis of the roller cage intersect each other under an obtuse angle. The outer surfaces of the rings 2 and 6"are also spherical, and the rollers 1 only slightly project outside the said surface and, therefore, have a ood guiding in the roller cage.

hen the rollers to be ground are to be introduced into the apparatus, the" grinding disc is first lowered by means of the lever 23 to its lowermost position, then the driving ring 2 with its fingers 8 is lowered by lever 10 sufiiciently for enabling the introduction of the rollers in the pockets of the roller cage, whereupon the lever 10 is-released and the spring 9 raises the driving ring 2. The grinding disc- 20 isthen raised by means of the lever 23 against the rollers, whereupon the automatic feedin device is brou ht in When the guiding ring 6 rotate, the rollers 1 are caused to rotate on the race of the stationary race ring 4. As the axis of the roller cage forms an angle with the axis of the grinding disc, the rollers perform in effect an oscillating movement (about the point a) in relation to the working surface 25 of the grind ing disc, whereby the rollers obtain the desired exact form.

The machine above described may be mod-ified in several ways without departing from.

the scope of the invention. If rollers having a concave peripheral surface are to be ground instead of barrel-shaped rollers, the grinding disc is disposed in such position in relation to the work that its working surface lies between the rollers and their centre of oscillation "a, the roller cage being, obviously,- modified in a corresponding manner.

What I claim is 1. Machinefor grinding rollers having an are shaped generatrix,, comprising in combination, a rotary grinding disc having-a curved workingpsurface to act on the rollers and form said are shaped generatrix, a race ring for holding the rollers with their peripheral surface presented to the curved working surface of the grinding disc, the axis of said race ring intersecting theiaxis tion.

of the grinding disc, and a roller cage adapted to cause the rollers to rotate relatively to the race ring during the grinding-opera- 2. Machine for grinding rollers having an are shaped generatrix, comprising in combination, a rotary inding disc havln a curved working sur ace to act on the ro ers and form said are shaped generatrix, and means .for causing the rollers to roll durin the grinding operation in contact with sai \curved working surface of the grinding disc, and in a path whose axis intersects the axis of the grindin disc.

3. Machine or grinding'rollers having an arcshaped generatrix, comprising in combination, a grinding disc having a curved working surface to act on the rollers and form said are shaped neratrix, astationary race ring for hol ing the rollers with their peripheral surface presented to the curved working surface of the grinding disc, I

the axis of said race ringintersecting. the axis of the grinding disc, and a rotary roller cage adapted to cause the rollers to roll on said race ring during the grinding operation.

4. Machine for grinding rollers having an arc-shaped generatrix, comprisin a grinding disc, a race ring the axis of yv ich forms an angle withithe axis of the grinding disc,

a roller cage for retaining the rollers against the said race ring and. consisting of'a retaming ring and a guiding mug, and means for driving the two latter rings with equal angular velocity in relation to the race ring, 5. achine for grinding rollers having an arc-shaped generatrix, comprisin a grinding disc the working surface 0 which is I formed in essential conformity with the arcshaped profile of the rollers, a' stationar race ring for the rollers, the axis of whic forms an angle with the axis of the grinding disc, a roller cage consisting of a retainin and driving ring and a guidin means for axially displacing sai .retaining and driving ring in relation to the race ring and the guiding ring.

. 6. Machine for grinding rollers having an arc-shaped generatrix, comprising a grinding disc having a spherical working surface a race ring for the rollers the axis of which forms an angle with the axis of the grinding disc, and a roller cage adapted to retain the rollers againstsaid race ring, during the" grinding operation, and having a substantially spherical outer surface.

7. Machine for grinding rollers having-an arc-shaped generatrix, ggiprising in. com-Q 'n bination, a ,rotary g disc havin a curved working sur ace to act on the rol ers ring an and form said are shaped generatrix, a

holder for the rollers rotatable about an axis which intersects the axis of the grinding disc, said holder adapted to retain a rality of rollers therein with their transverse plumiddle planes intersecting each other at a. to cause them to rotate about their individual point coincident with the point of intersecaxes in the rotation of the holder about its tion of the axis of the holder with the axis axis. W of the grinding disc, said holder presenting In testimony whereof I have signed my 5 the peripheral surface of said rollers to the name.

curved working surface of the grinding disc and means acting on the rollers in the holder VICTOR A. SVENSSON. 

